Ah yes, mine did take me off the M1at 38 when going to Mike Scotts Gas place instead of taking me the long way around up to the M62 and in to Huddersfield from the north not south along the narrow roads
Have a look at this route planner
Setra coaches use it for there own drivers.
Very good if you want any road that takes coaches.
I put in 70 mph and quickest route and it takes me on the best road there is.
We've travelled through Switzerland many times with a 8.5M A-class with no troubles at all. Passing through it's 90% motorways. The route has always been from Basel in the north to the St Gotthard tunnel in the south (and in reverse heading north). However, we've not done this for a dozen years or so but this year we're heading back to Italy in a 8.5M B-class towing a trailer and leading some friend in a Euro motorhome.